JPH11201310A - Check valve fitted with flow-rate measuring function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve fitted with a flow-rate measuring function capable of measuring a flow rate by a simple structure. SOLUTION: A pressure sensor 7 and a pressure sensor 8 are attached on the side of an inlet 4 and on the side of an outlet 5 of a check valve element 10, respectively, and a coil spring 11 is disposed on the side of the outlet 5 in an energized manner in the valve opening direction. A strain gauge 17 is attached to the coil spring 11. The displacement amount of the coil spring 11, that is, valve opening of the check valve element 10 is calculated by the strain gauge 17, and a rate of a flow running through a check valve is computed from a pressure difference between the primary side and the secondary side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve which is attached to various kinds of fluid pipes such as steam, compressed air and liquid to allow one-way fluid flow but to close the opposite fluid flow. In particular, the present invention relates to a check valve with a flow rate measurement function capable of measuring the flow rate of a one-way fluid flowing down the check valve.

[0002]

2. Description of the Related Art Conventional check valves include, for example, Japanese Utility Model Application
No. 0-10964. This is because the check valve body is formed in a disk shape and a protrusion is provided on the outer periphery thereof, and the outer end of the protrusion is slidably contacted with the inner peripheral wall surface of the valve casing, thereby permitting the flow of the fluid in one direction, but oppositely. The fluid flow in the direction is closed.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Although it can reliably function as a check valve, it cannot measure the flow rate flowing down the valve, so a flow meter must be installed separately from the check valve, which complicates fluid piping. However, there has been a problem that the mounting work becomes complicated.

Accordingly, an object of the present invention is to provide a check valve having a flow rate measuring function capable of measuring a flow rate with a simple structure.

[0005]

Means for solving the above-mentioned problems According to the present invention, an inlet and an outlet are formed by valve casing, and a valve seat is provided between the inlet and the outlet. A check valve in which a check valve body is disposed on the outlet side of the valve seat, and an elastic member that biases the check valve body toward the valve seat side is provided.
A primary pressure detecting means for detecting the fluid pressure on the inlet side and a secondary pressure detecting means for detecting the fluid pressure on the outlet side are attached, and a strain gauge for detecting elastic deformation of the elastic member is attached to the elastic member. A calculation unit for calculating the degree of opening of the check valve body from the elastic deformation is provided, and the flow rate flowing down the valve from the degree of opening of the check valve body and the primary and secondary pressures calculated by the calculation unit is provided. It is to calculate.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As is well known in the art, the flow rate flowing down a valve is k, a constant based on the type of fluid flowing down, ΔP the pressure difference between the primary side and the secondary side of the valve, and the valve opening degree. Is a parameter
Flow rate: Q = k, where Cv is the capacity coefficient specific to the valve
· Cv · △ P1 / 2 It can be calculated by the formula.

[0007] ΔP is obtained from the pressure on the primary side and the secondary side, and Cv is obtained by calculating the opening degree of the valve from the displacement detected by the strain gauge of the elastic member. Thus, the flow rate Q flowing down the check valve can be calculated.

[0008]

FIG. 1 shows an entire configuration diagram of a check valve having a flow rate measuring function according to the present invention. The inlet body 1 and the outlet body 2 form a valve casing. Inlet 4 connected to inlet body 1 and inlet pipe 3
And the outlet 5 is provided in the outlet body 2 so that the outlet pipe 6
Connect with A pressure sensor 7 as primary pressure detecting means is attached to the inflow pipe 3, and a pressure sensor 8 as secondary pressure detecting means is attached to the outflow pipe 6.

An annular valve seat 9 is provided at an end of the inlet main body 1,
A check valve body 10 is arranged facing the outlet 5 side of the valve seat 9.
The check valve body 10 has a size and a shape capable of covering the valve seat 9, and is arranged by being urged toward the valve seat 9 by a coil spring 11 as an elastic member. A sliding shaft 1 is provided at the center of the check valve body 10.
2 are attached together. The sliding shaft 12 is provided with a sliding support 1 provided on each of the ribs 15 and 16 on the inlet 4 side and the outlet 5 side.
By sliding the check valves 3 and 14, the check valve body 10 is displaced left and right to open and close.

In a compressed state, the coil spring 11 has one end housed in the rib 16 on the outlet 5 side and the other end arranged on the check valve body 10, and moves the check valve body 10 in the valve closing direction, that is, the valve seat 9 side. The coil spring 11 is provided with a strain gauge 17 for detecting the amount of elastic deformation of the coil spring 11.

The primary pressure of the check valve is detected by a pressure sensor 7, the secondary pressure is detected by a pressure sensor 8, and the displacement of the coil spring 11 is detected by a strain gauge 17, which is not shown. It is sent to the controller.

The controller section is provided with a storage section for storing a relation between the capacity coefficient Cv and the opening degree of the check valve element 10 and an equation for calculating the flow rate: Q from Cv and ΔP. And a calculation unit for calculating and displaying the flow rate from the relationship between these storage units.

The check valve causes the fluid from the inlet 4 to flow down to the outlet 5 side, but the flow on the opposite side, that is, the flow from the outlet 5 to the inlet 4 side, requires the check valve body 10 to be seated on the valve seat 9. It is closed by.

[0014]

By detecting the amount of elastic deformation of the coil spring as an elastic member with a strain gauge, the valve opening can be detected, and the structure of the conventional check valve can be easily changed without any change. A check valve capable of measuring a flow rate with a simple structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional configuration view showing an embodiment of a check valve with a flow rate measurement function of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet main body 2 Outlet main body 4 Inlet 5 outlet 7 Primary pressure sensor 8 Secondary pressure sensor 9 Valve seat 10 Check valve element 11 Coil spring 12 Sliding shaft 17 Strain gauge

Claims (1)

[Claims] An inlet and an outlet are formed by valve casing, a valve seat is provided between the inlet and the outlet, and a check valve is disposed on an outlet side of the valve seat. In a check valve attached with an elastic member that biases the valve seat side, while attaching a primary side pressure detecting means for detecting the fluid pressure on the inlet side and a secondary side pressure detecting means for detecting the fluid pressure on the outlet side, A strain gauge for detecting elastic deformation of the elastic member is attached to the elastic member, and a calculation unit for calculating an opening of the check valve body from the elastic deformation is provided, and the check valve body calculated by the calculation unit is provided. A check valve with a flow rate measurement function, wherein the flow rate flowing down the valve is calculated from the opening degree and the primary and secondary pressures.